21010932 has 72 divisors (see below), whose sum is σ = 55840512. Its totient is φ = 6652800.

The previous prime is 21010921. The next prime is 21010943. The reversal of 21010932 is 23901012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21010921) and next prime (21010943).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74632 + ... + 74912.

Almost surely, 2^21010932 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21010932, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27920256).

21010932 is an abundant number, since it is smaller than the sum of its proper divisors (34829580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21010932 is a wasteful number, since it uses less digits than its factorization.

21010932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 21010932 is about 4583.7683187526. The cubic root of 21010932 is about 275.9402832366.

Adding to 21010932 its reverse (23901012), we get a palindrome (44911944).

The spelling of 21010932 in words is "twenty-one million, ten thousand, nine hundred thirty-two".